Mouth-speculum.



J. F. KOEHLER. MOUTH SPEGULUM.

APPLICATION FILED APR. 13, 1910.

Patented N0v.22,1910.

THE NORRIS PETERS WASHINGTON, D- c.

JOHN F. KOEHLER, OF WEST HAMMOND, ILLINOIS.

MOUTH-SPECULUM.

Specification of Letters Patent. Patented N 22, 1910,.

Application filed April 13, 1910. Serial No. 555,154.

To all whom it may concern:

Be it known that 1, JOHN F. KonrrLER, a citizen of the United States,and residing at West Hammond, in the county of Cook and State ofIllinois, have invented a new and useful Improvement in Mouth-Specula,of which the following is a complete specification.

The main objects of this invention are to provide a mouth speculum whichwill have positively. acting opening and closing movements; to provide amouth speculum in which the movement of the jaw-bars is always undercomplete control of the operator; and to provide a cheap, simple andeasily operable mouth speculum, having but few and simple parts whichwill not easily get out of repair.

A specific construction embodying the invention is illustrated in theaccompanying drawings, in which:

Figure 1 is a side elevation of one of the side members of the mouthspeculum. Fig. 2 is a rear elevation of the same showing the teethplates broken'away. Fig. 3 is a section taken on line 38 of Fig. 1 withparts beyond the line of section omitted. Fig. 4 is a section taken online lt- 1 of Fig. 1 with parts beyond the line of section omitted.

In this construction two side members, each comprising an upper jaw-bar1 and a lower jaw-bar 2, are employed, one member on each side of theanimals head, but since the side members are identical, with the eX-ception that they are rights and lofts, only one side member is shown.

The j aw-bars 1 and 2 curve oppositely intermediate their ends, and therear ends 3 and 4 are pivotally connected together. The end 4 isprovided with a circular socket 5 and an integral plate 6 extendsupwardly from the outer face of said end and overlaps the end 3 which isrounded at 7 to correspond to the socket 5. On the outer face of the end3 is an internally threaded boss 8 which extends through an aperture inthe plate 6 and forms the bearing or pivot be tween the j aw-bars, and ascrew 9 is threaded into the boss from the outer face of the jaw-barsand its head overlaps the plate 6 and holds the jaw-bars connected.

The jaw-bars 1 and 2 are provided respectively with rearwardly directedarms 10 and 11, in which are journaled the outwardly or laterallydirected posts 12 and 13. An operating bolt 14 is journaled in the postl2 and has threaded connection in the post 13. The bolt is provided onits upper end with a winged head 15, by means of which the bolt may berotated, and which bears against the post 12. On the lower end of thebolt, beneath the post 13, is a head or nut 16 adapted to abut againstthe post 13 when the jaw-bars are in closed or nearly closed position,and prevent the bolt from being withdrawn.

A rearwardly extending lug 17 is formed on the plate 6 and has a slot 18therein to receive a strap which passes over the animals head, and thejaw-bars have slots 19 near their rear ends which receive straps to passover and under the animals jaws in the usual manner.

The forward ends of the jaw-bars are notched or forked at 20, and ineach fork is apin 22 to which the cupped teeth plates 22 and 23 of theusual construction are hooked in the usual manner.

The operation of the construction shown is as follows: The side members,with the jaw-bars closed and the teeth plates inserted between theanimals jaws, are secured one on each side of the animals head. Thebolts 14: are then rotated in a direction to cause them to traveldownwardly through the posts 13. The heads 15 bear downwardly on theposts 12 and the oppositely directed forces acting on the arms 10 and 11cause the jaw bars to open and force the animals jaws apart. When-thebolts are rotated in the reverse direction the jaw-bars are permitted toclose, but are always in complete control of the operator so that thedanger of the animals jaws coming together with such force as to injurethe teeth is entirely obviated.

Although but one specific embodiment of the invention is herein shown itwill be understood that many details of the construc tion shown may bevaried or omitted with out departing from the spirit of the invention.

I claim:

1. A mouth speculum, comprising a pair of pivotally connected jaw-bars,a bolt support journaled on each jaw-bar and a bolt journaled on one ofsaid supports and having threaded connection with the other sup port andadapted when rotated to open or close the bars.

2. A month speculum, comprising a pair of side members adapted to beconnected torotative means connecting the posts and gether, each sidemeinber having pivotally connected jaw-bars, a bolt connecting thejaw-bars and adapted to open and close the same and supporting means forsaid bolt journaled in the jaw-bars.

3. A mouth speculum, comprising a pair of side members adapted to beconnected together, each side member comprising a pair of pivotallyconnected jaw-bars, apertured posts journaled on said jaw-bars and Iconnection in the other post.

5. A side member for a mouth speculum, comprising a jaw-bar having asocket therein, a laterally offset, apertured plate carried on said barat one side of said socket, a jawbar having a laterally directed,internally threaded boss journaled in the aperture in said plate, ascrew engaged in said aperture and having its head overlapping saidplate, apertured posts journaled on said jaw-bars, and an operating boltjournaled in one postand having threaded engagement in the other post.

6. A mouth speculum, comprising upper and lower jaw-bars, meanspivotally connecting the upper jaw-bars with the lower jaw-bars, postsjournaled in the jawbars, and operating boltsv rotatively mounted insaid posts and adapted to open or close the jaw-bars.

In testimony whereof I have hereunto subscribed my name in the presenceof two witnesses.

JOHN F. KOEHLER.

Witnesses:

CARL A. LINDNER,

HENRY F. LINDNER.

